GS-35B(GS35B) is a Russian Power triode available for an very acceptable price,hi.

  Weaker Eimac 3CX1500A7/8877 tube is $800 price as regular.

With 4kV on plate >3.0 kW can be expected on 144MHz in a grounded grid amplifier!

GS-35B(GS35B) CHARACTERISTICS:

GS-35B(GS35B) Intermodulation distortion of the 3rd order - minus 32 dB

GS-35B(GS35B) Anode Dissipation - 2.5 kW

GS-35B(GS35B) Grid Dissipation - 26 W

Frequency for Max. Ratings- 1000,0 MHz !

Cathode- Oxide coated Heater voltage - 12,6V

Heater current - 2.95A

GS-35B(GS35B) Maximum CW Anode voltage -4.0 kV

GS-35B(GS35B) Maximum Instantaneous value Anode voltage-8.0 kV

GS-35B(GS35B) Maximum CW Cathode current-1.4 A

GS-35B(GS35B) Transconductance at Ua= 2.0 kV Ia = 350 mA -->32.5 mA/V

Capacitance Input /Output /Feed-through / -21 pF /4.4 pF/0.12 pF-Max.

GS-35B(GS35B) Seal and Envelope Temperature -200 C

Maximum Length -177 mm Maximum Diameter -100 mm

GS-35B(GS35B) Weight with heat sink: 2.5 kgs

Operating Position -Any

Blower -150 m3/h

But this GS-35B tube has big copper heat sink with very big heat inertia.
It is well coolled in pauses of work.
Air cooling can be simplest and calm.

More information? Very recommend!

You wanted 2000 watts?

or You wanted 6000 watts?